Sound amplifier



FIG. 1 is a top, left, front perspective view of the sound amplifier according to our design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is bottom plan view thereof; and,

FIG. 7 is a rear plan view thereof. 

The ornamental design for a sound amplifier, as shown and described. 